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Coyotes-Wolves-Cougars.blogspot.com

Grizzly bears, black bears, wolves, coyotes, cougars/ mountain lions,bobcats, wolverines, lynx, foxes, fishers and martens are the suite of carnivores that originally inhabited North America after the Pleistocene extinctions.
This site invites research, commentary, point/counterpoint on that suite of native animals (predator and prey) that inhabited The Americas circa 1500-at the initial point of European exploration and subsequent colonization.
Landscape ecology, journal accounts of explorers and frontiersmen, genetic evaluations of museum animals, peer reviewed 20th and 21st century research on various aspects of our "Wild America" as well as subjective commentary from expert and layman alike. All of the above being revealed and discussed with the underlying goal of one day seeing our Continent rewilded.....Where big enough swaths of open space exist with connective corridors to other large forest, meadow, mountain, valley, prairie, desert and chaparral wildlands.....Thereby enabling all of our historic fauna, including man, to live in a sustainable and healthy environment. - Blogger Rick

Ghosts in the Woods

by Meghan Oliver; northern woodlands.com

It occurred to me recently, after spotting a white-feathered American robin scampering along a dirt road, normal-colored robins alongside him, that in all my years of observing wildlife and working with wild birds as a rehabilitator, I’ve never seen any albino animals. Ever. Except in photos.
The robin I saw was far enough away that I couldn’t tell if it was albino (completely white), or leucistic (part white with some normal coloration). What I could tell, though, was that this robin was part of a flock, foraging for food on the ground, flying up into the trees as I drew closer. The bird’s life seemed relatively normal, even while its coloration was anything but.

Albino and leucistic animals lack melanin, the primary pigment that determines the color of the skin, fur, eyes, and feathers. Without melanin in the body, skin and eyes appear a reddish-pink as blood vessels are visible, and fur and feathers are white. Leucistic animals, which have a partial absence of melanin, will have normal skin and eye coloration, and may or may not have fully-white feathers or fur.

Beyond coloration, melanin is instrumental in the development of certain parts of the eyes, including the irises, retinas, eye muscles, and optic nerves. As a result, albino animals sometimes have vision problems, which in the wild can spell disaster.

From one biologists’ perspective, it’s hard to say for sure what life in the wild is like for albinos and leucistics. “There’s just not a lot of research on this,” said Kurt Rinehart, a doctoral candidate at the University of Vermont, and co-author of the book Behavior of North American Mammals. “In order to understand survivability for any population, you need lots and lots of animals.”

Steve Faccio, biologist at the Vermont Center for Ecostudies, said that of all the reported sightings of albinos that come in, about 90 percent of those are actually leucistic. According to data from Cornell Laboratory of Ornithology’s Project Feeder Watch – in which participants record what they’re seeing at their feeders – fewer than 1,000 leucistic birds were seen among the 5.5 million birds reported between 2000 and 2006, giving an idea to how small the leucistic population is.

an albino moose

A quick Google image search, however, might have you thinking otherwise. Type in “albino and leucistic animals,” and thousands of photos of white penguins, deer, snakes, and hummingbirds pop up on the screen. In some photos, a white mammal will be alongside normal-colored offspring.
“It’s definitely a heritable trait,” Rinehart said of albinism, but the traits necessary to create albino and leucistic offspring are “very recessive; it requires a very particular combination of genetic material to manifest.” Offspring would have a greater likelihood of being albino if born of two albino parents, Rinehart said, but the chances of two albinos existing in one wild population (let alone mating with each other) are incredibly rare.

The question of whether an off-colored exterior effects mate selection probably differs from species to species. For many mammals, Rinehart explained, much of how they interact with their peers and choose their mates has to do with smell, so in some instances, color may be of little concern.
“I’ve seen moose trying to mate with statues or anything that even remotely appears like a quadruped, so I don’t think color would dissuade them in the rut,” Rinehart said.

Birds, on the other hand, do pay attention to color. In a study on barn swallows, researchers noticed that the flocking birds would “gang up” on a leucistic swallow, Faccio said. “There was a lot of interspecies aggression among leucistic birds.” As for finding a mate, “leucistic and albino males might not have as good a chance as attracting a mate. Color is important in male birds.”

Fish may feel the effects of color, too. Rinehart said that at hatcheries, where thousands of fish are captive and therefore easily monitored, there are relatively large numbers of albinos and leucistics. In a study on the reproduction of guppies, albino mothers had smaller offspring than non-albinos, Rinehart said. Larger offspring tend to have higher survival rates, suggesting that “albinism may be linked to another aspect of biology – low size – that leads to low survival.” Rinehart said he would not be surprised if albinism compromises survival in other ways, too, in other animals.

an albino coyote

Faccio said there is differing evidence on survival rates from predators. “Some studies have shown albino animals are left alone by predators because they’re not recognized as prey, while some show they are more easily found, captured, and killed.” (I’d venture to guess an albino mourning dove might be easier prey for a cooper’s hawk.)

The unlikely appearance of that white American robin has shed a dim light on a hazy situation. The truth is, when it comes to understanding albino and leucistic animals, the facts are not (yet) black and white.

Two Massachusetts Eastern Coyotes at their den site

Eastern Wolf in Algonquin Provincial Park, Ontario, Canada

Aldo Leopold--3 quotes from his SAN COUNTY ALMANAC

"We abuse land because we regard it as a commodity belonging to us. When we see land as a community to which we belong, we may begin to use it with love and respect."

Aldo Leopold

"A thing is right when it tends to preserve the integrity, stability and beauty of the biotic community. It is wrong when it tends otherwise."

Aldo Leopold

''To keep every cog and wheel is the first precaution of intelligent tinkering."

Wildlife Rendezvous

Like so many conscientious hunters and anglers come to realize, good habitat with our full suite of predators and prey make for healthy and productive living............Teddy Roosevelt depicted at a "WILDLIFE RENDEZVOUS"

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This is a personal weblog. The opinions expressed here represent my own and not those of my employer. In addition, my thoughts and opinions change from time to time…I consider this a necessary consequence of having an open mind. This blog is intended to provide a semi-permanent point in time snapshot and manifestation of my various thoughts and opinions, and as such any thoughts and opinions expressed within out-of-date posts may not be the same, nor even similar, to those I may hold today. All data and information provided on this site is for informational purposes only. Rick Meril and WWW.COYOTES-WOLVES-COUGARS.COM make no representations as to accuracy, completeness, suitability, or validity of any information on this site and will not be liable for any errors, omissions, or delays in this information or any losses, injuries, or damages arising from its display or use. All information is provided on an as-is basis.